INTRODUCTION TO THE PROTOZOA 33 



formed from host cell hemoglobin. Without spores. Nucleus vesicular. Without 

 flagella or cilia. Locomotion by body flexion or gliding. Reproduction asexual, 

 by binary fission or schizogony. Existence of sexual reproduction dubious. All 

 parasitic. Heteroxenous. Vectors (if known), Lxodid or argasid ticks. 



Order PIROPLASMORIDA 



With the characters of the class. 



Family BABESHDAE 



Relatively large, piriform, round or oval parasites occur- 

 ring in erythrocytes of vertebrate host. Asexual reproduc- 

 tion in erythrocytes by binary fission or schizogony. 



Aegyptianella 



Babesia 



Echinozoon 



Family THEILERIIDAE 



Relatively small, round, oval, irregular or rod-shaped 

 parasites of erythrocytes and lymphocytes or histiocytes of 

 vertebrate host. The forms in the erythrocytes may or 

 may not reproduce; in the former case they divide into 2 or 

 4 daughter cells. Asexual reproduction by schizogony (or 

 a series of binary fissions) in lymphocytes or histiocytes 

 followed by invasion of erythrocytes. 



Cytauxzoon 

 Gonderia 

 The Her ia 



Class TOXOPLASMASIDA 



Without spores. With cysts or pseudocysts containing many naked trophozoites. 

 Nucleus vesicular. Without flagella or cilia. Locomotion by body flexion or glid- 

 ing. Reproduction asexual, by binary fission or endodyogeny (and possibly by 

 schizogony in young cysts). All parasitic. Monoxenous. 



Order TOXOPLASMORIDA 



With the characters of the class. 



Family SARCOCYSTIDAE 



With cysts. Multiplication by binary fission, and possibly 

 also by schizogony in young cysts. 



Sarcocystis 



